EP2363854B1 - Medium processor and magnetic head adaptable to same - Google Patents
Medium processor and magnetic head adaptable to same Download PDFInfo
- Publication number
- EP2363854B1 EP2363854B1 EP11167254.9A EP11167254A EP2363854B1 EP 2363854 B1 EP2363854 B1 EP 2363854B1 EP 11167254 A EP11167254 A EP 11167254A EP 2363854 B1 EP2363854 B1 EP 2363854B1
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- EP
- European Patent Office
- Prior art keywords
- yoke
- magnetic
- magnet
- magnetic head
- head
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Images
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
- G11B5/00804—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic sheets
- G11B5/00808—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic sheets magnetic cards
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
- G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/04—Payment circuits
- G06Q20/042—Payment circuits characterized in that the payment protocol involves at least one cheque
Definitions
- the present invention relates to a magnetic head comprising a magnet magnetized to an N pole and an S pole along the transport direction in which information recording media are transported, a yoke attached to a face of said permanent magnet opposed to said magnetic recording media, and a gap created in said yoke wherein at least one of the end portions of said gap is closed to form a closed section of said yoke.
- Such a magnetic head is known from US 2 763 729 A .
- JP 2003 077 104 A discloses a similar magnetic head comprising a permanent magnet.
- US 3 665 513 A deals with a transaction record which is prepared in both human and machine readable form by providing a card having both embossed data and magnetic data thereon and simultarteously imprinting the embossed data on a record card while transferring the magnetic data to a magnetizable portion of the record card.
- the magnetic data on the card is comprised of a plurality of discrete magnetic bits and is transferred to the magnetizable portion of the record card by subjecting the magnetic data and the magnetizable portion to a saturating prebiased D.C. field followed by a weaker D.C. transfer field.
- checks which are information recording media may be used for payments at stores in place of cash or credit cards.
- the store takes the check to a banking institution such as a bank so that cash is drafted from the customer's account to the store's account to complete the payment transaction.
- MICR characters Magnetic Ink Character Recognition: magnetic ink
- MICR characters Magnetic Ink Character Recognition: magnetic ink
- the read data is transmitted together with the payment amount to a server in a banking institution. According to such an electronic payment system, there is no need to bring the check used for payment to the banking institution, improving efficiency of work.
- a conventional structure of the aforementioned media processing device as disclosed e.g. in the Japanese patent application H07-33307 is shown in Fig. 11 which is a cross-sectional side view of the structure of a conventional media processing device 1100.
- a conventional media processing device 1100 mainly comprises a magnetizing head 1100 as a magnetic head, an image sensor 1102, a reading head 1103, a frame 1105 constituting a transport passage 1104, and a gate 1106 through which a check 1107 is inserted.
- the MICR characters on the inserted check 1107 are first magnetized by the magnetizing head 1101 arranged upstream of the transport passage 1104, and then the data is read by the reading head 1103 arranged downstream of the transport passage 1104. Note that the MICR character is temporarily magnetized by the magnetizing head 1101 in order to recover the magnetization of the MICR characters, which has been weakened by being exposed to strong magnetic fields during the distribution process so that accurate data reading can be performed by the reading head 1103.
- Fig. 11 (b) is a side cross-sectional view of the enlargement of the vicinity (inside Z framed by a dotted line) of the magnetizing head 1101 of the media processing device shown in Fig. 11 (a) .
- the magnetizing head 1101 is arranged such that a slide-contact face 1101 a thereof is exposed to the transport passage 1104 from the frame 1105.
- the frame 1105 constituting the transport passage 1104 is not continuous with the slide-contact face 1101 a of the magnetizing head 1101 (see Fig. 11 (b) ); therefore, a misshaped medium such as a check 1107 with a folded edge may get stuck at the discontinuous section, causing a jam.
- dust can easily build up around the discontinuous section of the frame 1105. Particularly, dust easily builds up due to the magnetic field generated by the magnetizing head 1101. Consequently, when a large amount of dust builds up around this section, a jam is caused.
- the magnetizing head 1101 needs to be fitted into a hole bored in the frame 1105; at that time, it may require time and effort to position the magnetizing head considering how much the magnetizing head 1101 should be protruded from the hole or how much recessed from the hole.
- the magnetizing head 1101 which can be applied to the media processing device 1100 shown in Fig. 11 , there may be a case that the magnetization to the information recording media is weak depending on the mounting precision of the magnetizing head 1101. Therefore, when a medium having a small retaining force is magnetized, it may be magnetized in the wrong direction. Then, when it is magnetized in the wrong direction, magnetic information on the information recording medium cannot be read correctly.
- the present invention is devised considering the above problems, and an object is to provide a magnetic head which can prevent a degradation of reading accuracy of the magnetic information.
- a magnetic head comprising a magnet magnetized to an N pole and an S pole along the transport direction in which information recording media are transported, a yoke attached to a face of said permanent magnet opposed to said magnetic recording media, and a gap created in said yoke wherein at least one of the end portions of said gap is closed to form a closed section of said yoke, characterized in that said magnet is a permanent magnet, said yoke is located between said permanent magnet and the transported magnetic recording media, said gap is located between said permanent magnet and the transported magnetic recording media and is formed along a border line between the N pole and the S pole, and said closed section of said yoke is opposed to the magnetic recording media.
- the magnetic head while maintaining precision of the gap length, the magnetic head can be easily assembled. Also, since at least one end portion of the magnetic head is closed, the magnetic short can be established, resulting in more effective use of leakage flux.
- the magnetic head (magnetizing head) is provided with the yoke attached on the outside circumferential face of the magnet opposed to the transport passage in which information recording media are transported and a slit formed in the yoke such that the longitudinal direction thereof is perpendicular to the transport direction; since the yoke is extended to be longer than the magnet in the transport direction, of the magnetic flux produced from the magnet the leakage flux which is not needed for magnetization can be reduced.
- the magnetic head of the present invention is configured such that at least one of the end portions of the slit is closed. Therefore, the leakage flux that leaks from the slit end portions can be reduced, thus preventing error in magnetization which is caused due to such a leakage flux.
- a tip end portion in said transport direction of an extended portion of the yoke is provided with a return yoke portion, and in particular can be bent toward a back yoke attached to an opposite face of said permanent magnet to form the return yoke portion.
- the yoke be constructed from a single sheet of metal. In this way, the yoke can be easily attached to the magnet.
- both end portions of the gap be closed. In this way, magnetic flux leakage can be concentrated toward the information recording media.
- Fig. 1 (a) is a cross-sectional side view of the configuration of a media processing device 1 of an embodiment of the present invention.
- Fig. 1 (b) is a diagram showing the external design of a check 17 which is inserted into the media processing device 1.
- the media processing devices include card readers, for example, and magnetic cards other than checks may be used as information recording media.
- a transport passage 14 in which the check 17 is transported is constructed by a frame 15 formed of a nonmagnetic material. Also, around the transport passage 14, a magnetizing head 11 (that corresponds to the magnetic head described in the claims), an image sensor 12, and a reading head 13 are arranged. Note that the check 17 is taken into the media processing device 1 via a gate 16. Also, in the media processing device 1, a drive roller (not illustrated) is provided; the drive roller applies the drive force to an endless belt (not illustrated) that forms part of the transport passage 14 so that the check 17 is transported in the transport passage 14.
- the magnetizing head 11 magnetizes magnetic material printed on the front surface of the check 17 such as the MICR characters 17a (see Fig. 1 (b) ); the image sensor 12 scans the front surface of the check 17 and reads the image data; the reading head 13 reads the MICR characters 17a that have been magnetized by the magnetizing head 11.
- the check 17 is detected by a detection sensor which is not illustrated and the drive roller is driven to rotate.
- the drive roller is rotated, a drive force is transmitted to the endless belt and the check 17 inserted at the gate 16 is transported further inside the media processing device 1.
- the MICR characters 17a are magnetized; as the check 17 passes the position that faces the image sensor 12, the front surface of the check 17 is scanned; as the check 17 passes the reading head 13, the data recorded in the MICR characters is read.
- the magnetizing head 11 is embedded in the frame 15 while a portion of the frame 15 is interposed between the magnetizing head and the transport passage.
- Fig. 2 will be used to describe how the magnetizing head is embedded.
- Fig. 2 is a cross-sectional side view of an enlargement of the vicinity of the magnetic head 11 I (inside the frame Y defined by a dotted line) of the media processing device shown in Fig. 1 (a) .
- a portion of the frame 15 is interposed between the magnetic head 11 and the transport passage 14.
- the bottom face of the magnetizing head 11 in the figure since the transporting passage 14 is not discontinuous, even when the edge of the check 17 is folded, a jam is prevented from being caused in the vicinity of the magnetizing head 11.
- the surface of the transport passage 14 opposed to the magnetizing head 11 is not exposed to the transport passage 14. Therefore, dust accumulation is prevented near the position opposed to the frame constituting the transport passage 14, ensuring the prevention of a jam.
- the magnetizing head 11 is arranged in the recess portion 15a cut in the frame 15 and bonded by an adhesive 20 to the frame 15 on the side opposite from the transport passage 14. Therefore, the magnetic head 11 can be secured to the frame, obtaining reliability of the positioning. Also, the magnetizing head 11 can be easily mounted. Further, because of the adhesive 20, dust is prevented from entering the gap between the magnetizing head 11 and the frame 15.
- Fig. 3 is a diagram showing an example of the detailed configuration of the magnetizing head 11 shown in Fig. 1 (a) .
- the magnetizing head 11 in the media processing device 1 is in a shape of rectangular solid, composed of a permanent magnet 11 a, a front yoke 11 b and a back yoke 11 c.
- a permanent magnet 11 a a permanent magnet 11 a
- a front yoke 11 b a front yoke 11 b
- a back yoke 11 c a permanent magnet 11 a
- a back yoke 11 c As shown in Fig. 3 (b) , in the center of the front yoke 11 b an oblong slit 11 d is formed, and the slit 11 d functions as a gap to cause leakage flux from the permanent magnet 11a.
- the magnetic flux produced from the N pole of the permanent magnet 11a (the N pole on the right side in Fig. 3 (a) ) mainly passes the front yoke 11b near the slit 11 d, the frame 15, the transport passage 14, the frame 15, and the front yoke 11 b near the slit 11 d, and then returns to the S pole of the permanent magnet 11 a (the S pole on the left side in Fig. 3 (a) ).
- the depth of the recess portion 15a in the frame 15 or the distance between the recess portion 15a and the transport passage 14 is configured such that, considering the magnetic force of the permanent magnet 11 a or the magnetic force necessary to magnetize the MICR characters, the MICR characters formed on the check 17 transported in the transport passage 14 can be magnetized.
- magnetic flux produced from the N pole of the permanent magnet 11 a is at the strength with which it flows through the inside of the transport passage 14, i.e., it reaches the other frame which the magnetizing head 11 is not provided.
- the bottom face of the recess portion 15a of the frame 15 is in a flat shape, and the back face of the front yoke 11 b opposed to bottom face in the flat shape (the face opposed to the transport passage 14) is also made in a flat shape, not in an R shape. Therefore, the positioning between the magnetizing head 11 and the frame 15 can be simplified. Also, a normal magnetizing head 11 is covered by a case cover formed of aluminum, for example; however, the case cover can be omitted by using the recess portion 15a and the adhesive 20. This contributes to cost reduction.
- the magnetizing head 11 may be simply fixed (by applying pressure) on the frame 15.
- the adhesive 20 may be applied around the periphery of the magnetizing head 11.
- the dimension of the recess portion 15a cut in the frame 15 may be aligned with the dimension of the magnetizing head 11 so that the magnetizing head 11 is fitted into the recess portion 15a. In this way, the magnetizing head 11 can be positioned without using the adhesive 20.
- the material of the frame 15 may be changed.
- the frame 15 is formed of a resin material which is an example of a nonmagnetic material.
- a ceramic frame may be used instead of the frame of a resin material.
- the frame formed of a metal is used, the above materials may be used. Any material can be used as long as the magnetic flux produced from the magnetizing head 11 magnetizes the MICR characters formed on the check 17 which is transported in the transport passage 14.
- magnetizing head magnetic head
- the magnetizing head is used for magnetizing the MICR characters, it is not limited to this use, but may be used as a demagnetizing head for weakening magnetization of the MICR characters.
- Fig. 4 is diagrams showing the magnetic head of the present invention: (a) is a front view of the surface of the magnetic head that makes contact with the information recording media (not illustrated); (b) is a cross-sectional side view of (a) cut along the xx-xx line; (c) is a cross-sectional side view of (a) cut along the yy-yy line.
- the magnetizing head 101 as a magnetic head has a cuboid magnet 110 having the N poles and the S poles, a yoke 120A and a back yoke 120B attached sandwiching the magnet 110 between them, and a gap 130 created in the yoke 120A.
- the magnet 110 is a cuboid permanent magnet and, as shown in Fig. 4 (b) , magnetized to four poles of the N poles and the S poles in the cross section perpendicular to the media-transport direction. Note that the border line L between the N poles and the S poles is indicated by dotted lines in Fig. 4 for easy description.
- the magnet 110 can be any kind as long as it is a permanent magnet; in this embodiment, a stable ferrite magnet is used because of its large coercive force and resistance to demagnetization.
- the yoke 120A On the side of the magnet 110 which faces the check as an information magnetic medium, the yoke 120A is secured by an adhesive, etc.; in the same manner, the back yoke 120B is secured by an adhesive, etc. on the opposite side [of the magnet 110]. As shown in Fig. 4 (a) , the yoke 120A is in the same dimension with [that of] the shape of the surface 111 of the magnet 110 on the side where the check slides over, covers the surface of the magnet 110 (entirely), and is formed from a single sheet of metal in this embodiment.
- the back yoke 120B is machined to the same dimension as that of the shape of the surface 111 of the magnet 110 and secured by an adhesive or the like so as to cover the surface of the magnet 110 (entirely).
- the yoke 120A and the back yoke 120B are formed of a magnetic material and used to direct the magnetic flux supplied from the magnet 110 in a predetermined direction. Therefore, unnecessary leakage flux from the magnet 110 is prevented.
- the material of the yoke 120A and back yoke 120B can be any material as long as it is easy to machine and can be magnetized; a ferromagnetic material having various kinds of soft magnetic properties or half-hard magnetic properties can be used. In this embodiment, a metal sheet is used.
- the yoke 120A is about 1 mm thick.
- the back yoke 120B is about 1 mm thick.
- the yoke 120A and the back yoke 120B are molded of the same material.
- the gap 130 is created along the border line, L, to cause leakage flux.
- the gap 130 is shaped like a groove; the bottom portion thereof reaches to the surface 111 of the magnet 110, that is, the magnet 110 is exposed.
- the groove that configures the gap 130 is constructed such that the width thereof is the same on both the media-sliding side and the magnet 110 surface side.
- the gap 130 has a predetermined length (hereinafter denoted as a gap length G) in the transport direction of the check (information magnetic medium) and a predetermined width, W, in the direction perpendicular to the transport direction of the check.
- the width, W is equal to or slightly longer than the width of the data region created on the check that is being transported.
- the gap length, G is formed to be symmetric in the transport direction about the border line L. Note that, in the first embodiment, the gap length G is created integrally into the shape of the yoke 120A by pressing.
- both end portions of the area (position) of the gap 130 in the direction perpendicular to the transport direction of the check are closed; they are made as the closed sections 135. Further, in this embodiment, the closed sections 135 function as a magnetic short that shorts magnetism to reduce the generation of leakage flux.
- the gap 130 is created in a shape best suited for magnetization and demagnetization of normal checks; when an information recording medium is something other than a check, the design of [the gap] is modified according to the magnetic section of the information recording medium.
- the yoke 120A is 1mm thick, and the closed sections 135 have the widths w1, w2 of about 1 mm measured from the end portions on both sides of the yoke 120A.
- the widths w1, w2 of the closed sections 135 are not limited to the number set in the first embodiment; although the two widths w1, w2 of the closed sections 135 are set to the same number value from each other, 1 mm in this embodiment, they are not limited to the same width and the number value, 1 mm, but can be suitably changed to function according to the kinds of the information recording media which will be transported. Note that when the widths w1, w2 of the closed sections 135 are large, there will be no magnetic saturation and leakage flux at the gap 130 is reduced; therefore, the widths are suitably set through simulations.
- the closed sections 135 are formed at the both ends of the gap 130; therefore, leakage flux is not easily produced in this structure except toward the information recording medium.
- the magnetic head 101 has the closed sections 135 which shorts magnetism, thus preventing excessive flux leakage. Further, leakage flux can be increased in the transport direction of the information recording media.
- the magnetizing head 101 as a magnetic head is configured such that the yoke 120A having the gap 130 is fixed on the magnet 110 to create an annular magnetic path.
- internal magnetic flux is produced from the yoke 120A that covers the N pole to the yoke 120A that covers the S pole; in the gap 130, leakage flux is generated from the yoke 120A that covers the N pole to the yoke 120A that covers the S pole, as indicated by arrow A.
- a check (information recording medium) is transported toward the magnetizing head 101 and slides on the surface of the yoke 120A of the magnetizing head 101. In the vicinity of the gap 130, leakage flux has been produced which links with the MICR characters on the check for magnetization. Since the permanent magnet 110 is used in the first embodiment, the MICR characters on the check are magnetized uniformly by magnetization of constant size and direction.
- the magnetic head 101 has the back yoke 120B fixed on the magnet 110; in the back yoke 120B, the direction of internal magnetic flux is indicated by B as shown in Fig. 4 (b) .
- the back yoke 120B is a magnetic short that shorts magnetism of the magnet 110. This configuration reduces the generation of unnecessary leakage flux to the outside.
- the magnetizing head 101 as a magnetic head of this embodiment has the magnet 110 which is magnetized to the N pole and the S pole along the direction in which a check as an information recording medium is transported, the yoke 120A attached to the face of the magnet 110 opposed to the check, and the gap 130 created in the yoke 120A, and the closed section 135 is formed at least one of the end portions of the gap. Because of this configuration, the magnetizing head 101 can be easily assembled while maintaining precision of the gap length, G.
- the yoke 120A is constructed from a single sheet of metal, the yoke 120A is fixed onto the surface 111 of the magnet 110 by using an adhesive so that the magnetic head 101 can be easily installed while maintaining precision of the gap length, G, and no effort is required for the positioning of the gap 130.
- the magnetizing head 101 can short magnetism with the closed sections 135 created at both ends of the gap 130, leakage flux from the gap 130 can be effectively used; since leakage flux is generated in the transport direction of the check, the flux quantum can be increased. In other words, leakage flux can be concentrated in the transport direction of the check because of the closed sections 135 created in the yoke 120A. Further, excessive flux leakage can be prevented; therefore, the magnet can be downsized, thus making it possible to downsize checks or information recording media.
- the back yoke 120B is attached to the face of the magnet 110 on the opposite side from the face that faces the check; therefore, magnetic flux from the magnet is directed to the back yoke 120B to prevent the magnetic flux from flowing to the core of the magnetizing head 101.
- the yoke 120A and the back yoke 120B are formed in a shape to cover the surface 111 of the magnet 110 and the opposite surface from the surface 111; however, the shape is not limited to this. They may not be formed from a single sheet of metal, but the gap and the closed sections may be formed first and then the closed sections are joined together to create a single yoke. Even in this case, the closed sections make contact with each other to obtain precision of the gap length, G.
- the thickness of the yoke 120A and the back yoke 120B can be any thickness as long as the thickness functions according to the type of the information recording media which are transported, and thus can be changed accordingly.
- Fig. 5 is a diagram showing a magnetic head of another embodiment of the present invention. Note that the same codes are given to the same components as those of the above-described first embodiment.
- a magnetizing head 150 as a magnetic head, a yoke and a back yoke are formed integrally, and a yoke 121A constructed from a single sheet of metal is used to cover the periphery of the magnet 110.
- the yoke 121 A surrounding the periphery [of the magnet] directs magnetic flux supplied from the magnet 110 in a predetermined direction. Therefore, in the same manner as the yoke 120A and back yoke 120B shown in Fig. 4 , unnecessary leakage flux from the magnet 110 is prevented.
- the magnetizing head 150 has the cuboid magnet 110 magnetized to the N pole and the S pole, the yoke 121 A attached covering lit: interposing the magnet 110, and the gap 130 created in the yoke 121A, in the same manner as in Fig. 4 .
- the magnet 110 is covered with the yoke 121A provided with the gap 130.
- the closed sections 135 are formed.
- the yoke 121A also functions as the back yoke.
- the shape of the gap 130 and the closed sections 135 formed near the gap 130 are the same as those shown in Fig. 4 , and their description is omitted.
- the yoke 121A is formed so as to cover the magnet 110 around its periphery, that is, it is formed in a so-called carling shape having the end portions 151 to also cover the two sides of the magnet formed in the transport direction of the check.
- the yoke 121A is constructed from a single sheet of metal member. More specifically described, the yoke 121A covers four sides of the magnetizing head 150. Note that the yoke 121A may be shaped as a cylinder without the end portions 151.
- the yoke 121A covers four sides; therefore, the generation of excessive leakage flux can be further reduced and magnetic force is increased, making it possible to downsize the magnet 110, which in turn downsizes the magnetizing head 150.
- each of the closed sections 135A shown in Fig. 6 is constructed with the joined portion and the groove portion which is shorter in length than the gap length, G. Leakage flux will be generated from the groove portion to some extent; however, the groove portion has the function of magnetic short, as described above.
- the magnetizing head 155 has the cuboid magnet 110 magnetized to the N pole and the S pole, a yoke 122A and a back yoke (not illustrated) having the magnet 110 interposed between them, and a gap 130A created in the yoke 122A.
- the yoke 122A provided with the gap 130A is attached so as to cover the magnet 110.
- the magnet 110 used in the magnetizing head as a magnetic head shown in Fig. 4 through Fig. 6 may be configured by a combination of divided magnets.
- Fig. 7 is a cross-sectional side view of an enlargement of the vicinity of the magnetizing head (inside the frame Y defined by a dotted line) that can be applied to the media processing device 1 shown in Fig. 1 (a) .
- a magnetizing head 211 of the second embodiment is composed of a magnet 211 a magnetized to different poles (from the N pole to the S pole in Fig. 7 (a) ) along the transport direction (from right to left in Fig. 7 (a) ) in which a check 17 is transported, a yoke 211 b attached to a face of the outside periphery of the magnet 211 a opposed to the transport passage 14 in which the check 17 is transported, and a back yoke 211 c attached to another face of the outside periphery of the magnet 211 a on the opposite side from the face opposed to the transport passage 14.
- the magnetizing head 211 1 is positioned (fixed) by an adhesive such as epoxy on the guide (such as a nonmagnetic SUS sheet) constituting the inside peripheral surface of the transport passage 14 such that the top and bottom end faces of the magnet 211 a are parallel with respect to the check 17.
- an adhesive such as epoxy on the guide (such as a nonmagnetic SUS sheet) constituting the inside peripheral surface of the transport passage 14 such that the top and bottom end faces of the magnet 211 a are parallel with respect to the check 17.
- Fig. 7 (b) is a view of the yoke 211 b seen from the transport passage.
- the yoke 211 b is constructed from a single sheet of metal, and a slit (also called “magnetic gap") is created in part of the yoke such that the longitudinal direction thereof is perpendicular to the transport direction (see the black colored portion in Fig. 7 (b) ).
- the slit has both end portions closed.
- the yoke 211 b constituting the magnetizing head 211 is extended toward the reading head 13 to be longer than the magnet 211 a in the transport direction of the check 17.
- Magnetic flux produced from the magnet 211 a is divided into magnetic flux used for magnetization (see the arrow AA in Fig. 7 (a) ) and leakage flux which is not needed for magnetization (see the arrows BB, B'B' of Fig. 7 (a) ); because of the structure of the yoke 211 b, the latter leakage flux is directed to the yoke 211 b and does not easily enter the transport passage 14; therefore, leakage flux which is not needed for magnetization is reduced from entering the transport passage 14.
- the front end portion of the yoke 211 b shown in Fig. 7 (a) is bent toward the back yoke 211 c to form a return yoke portion 211 d.
- magnetic flux which is not needed for magnetization that is the leakage flux indicated by a solid line arrow B'B'
- a magnetic path having a low magnetic resistance is formed by the yoke 211 b, the return yoke portion 211 d, and the back yoke 211 c; therefore, the leakage flux entering the transport passage 14 can be effectively reduced.
- the yoke portion 211 b is extended toward the reading head 13; therefore, of the magnetic flux from the magnet 211 a, the unnecessary leakage flux which enters the transport passage 14 (indicated by the dotted line arrow CC in Fig. 7 (a) ) can be reduced (or prevented), thus preventing degradation of reading accuracy of the magnetic information. Also, with the yoke 211 b (and the return yoke portion 211 d) a manufacturing process of creating a slit in the yoke in which two pieces of sheets, each of which has a recess portion, are put together is not needed; thus, the manufacturing process can be simplified.
- magnetic permeability of the yoke 211 b be even everywhere along the yoke; however, when the yoke is constructed from multiple metal sheets, it may be necessary to adjust magnetic permeability. In contrast, a yoke composed of a single sheet of metal does not require such adjustment.
- the back yoke 211c is attached to the face on the outside periphery of the magnet 211 a on the opposite side from the face opposed to the transport passage 14; therefore, a magnetic path (magnetic circuit) having a low magnetic resistance can be formed on the face of the magnet on the opposite side from the face opposed to the transport passage 14, and consequently, leakage flux from this face can be reduced.
- leakage flux directed in the opposite direction is easily generated in the vicinity of the yoke near the reading head (the S pole); however, in the magnetizing head 211 of this embodiment, leakage flux can be reduced even by the return yoke portion 211 d as described above and also reduced by adjusting the gap between the magnet 211 a and the return yoke portion 211 d.
- the shorter the distance of the above-described gap the less leakage flux entering the transport passage 14.
- the magnetic flux used for magnetization the magnetic flux produced in the vicinity of the slit
- a predetermined distance needs to be set to an optimal value based on the relationship between the magnetic flux generated in the vicinity of the slit and the leakage flux which is not needed for magnetization.
- the magnetizing head 211 of this embodiment there is no need to provide an opening to the guide which constitutes the inner peripheral face of the transport passage 14, thus simplifying the manufacturing process. Also, the slit adjustment between the surface of the magnetic head 211 and the surface of the check 17 can be managed by the thickness of the sheet of the guide; therefore, the adjusting step is not needed, thus simplifying the manufacturing process. Further, since the outside dimension of the magnetic head 211 is small, freedom in designing the media processing device 1 is improved. An installation holder to the media processing device 1 can also be eliminated.
- FIG. 8 is an explanatory illustration of the configuration of a magnetizing head 211A in the media processing device 1 of another embodiment of the present invention.
- the yoke portion 211 b is extended toward the reading head 13 only; however, as shown in Fig. 8 , the yoke portion 211 b may also be extended in the opposite direction from the reading head 13.
- Fig. 9 is a cross-sectional side view of the configuration of a magnetizing head 211 B of a media processing device 1 of another embodiment of the present invention.
- the return yoke portion 211 d may be formed at the tip end of an inclining portion 211 e which is formed by bending part of the yoke portion 211 b.
- the part of the yoke portion 211 b be bent at obtuse angle or curled; it can be formed in any shape. Since the inclining portion 211 e is provided in this manner, in the return yoke portion 211d there is no portion which is bent at right angle in the vicinity of the transport passage 15; therefore, unnecessary magnetic flux is prevented from flowing toward the transport passage 15.
- a magnetizing head 211 B when such a magnetizing head 211 B is used, it may be arranged as in a conventional magnetic head such that its slide-contact surface, that is the yoke portion 211 b lit: the return yoke portion 211 d, is exposed from the frame 15 to the transport passage 14.
- the frame 14 is not discontinuous in the vicinity of the magnetic head 211 B; therefore, dust is prevented from building up near the position in the transport passage 15 facing the magnetic head 211 B, thus preventing a jam.
- Fig. 10 is a cross-sectional side view of the configuration of a magnetic head 211C in the media processing device 1 of another embodiment of the present invention.
- the return yoke portion 211 d is provided; however the device may be configured without the return yoke portion as shown in Fig. 10 . In this case, processability is improved because the return yoke portion 211 d is not formed.
- the present invention is not limited to the above configuration, but the yoke may be extended only toward the reading head and the return yoke portion may be omitted.
- the back yoke may be removed from the magnetizing head.
- the back yoke may be removed from the magnetizing head.
- the yoke may be formed not from a single sheet of metal but by combining two metal sheets (left yoke, right yoke), each of which has a recess portion.
- the magnetizing head may be arranged such that the slide-contact surface of the magnetizing head shown in Fig. 3 through Fig. 10 , that is the return yoke portion, is exposed from the frame to the transport passage.
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Abstract
Description
- The present invention relates to a magnetic head comprising a magnet magnetized to an N pole and an S pole along the transport direction in which information recording media are transported, a yoke attached to a face of said permanent magnet opposed to said magnetic recording media, and a gap created in said yoke wherein at least one of the end portions of said gap is closed to form a closed section of said yoke.
- Such a magnetic head is known from
US 2 763 729 A . -
JP 2003 077 104 A -
US 3 665 513 A deals with a transaction record which is prepared in both human and machine readable form by providing a card having both embossed data and magnetic data thereon and simultarteously imprinting the embossed data on a record card while transferring the magnetic data to a magnetizable portion of the record card. The magnetic data on the card is comprised of a plurality of discrete magnetic bits and is transferred to the magnetizable portion of the record card by subjecting the magnetic data and the magnetizable portion to a saturating prebiased D.C. field followed by a weaker D.C. transfer field. - Conventionally, checks which are information recording media may be used for payments at stores in place of cash or credit cards. When paid by check, the store takes the check to a banking institution such as a bank so that cash is drafted from the customer's account to the store's account to complete the payment transaction.
- In recent years, such check payment transactions have been made electronically. More specifically described, the magnetic substance such MICR characters (Magnetic Ink Character Recognition: magnetic ink) printed on the front surface of a check encode data (for example, account number and serial number) which is read by a media processing device placed in a store. The read data is transmitted together with the payment amount to a server in a banking institution. According to such an electronic payment system, there is no need to bring the check used for payment to the banking institution, improving efficiency of work.
- A conventional structure of the aforementioned media processing device as disclosed e.g. in the Japanese patent application
H07-33307 Fig. 11 which is a cross-sectional side view of the structure of a conventionalmedia processing device 1100. As shown inFig. 11 (a) , a conventionalmedia processing device 1100 mainly comprises amagnetizing head 1100 as a magnetic head, animage sensor 1102, areading head 1103, aframe 1105 constituting atransport passage 1104, and agate 1106 through which acheck 1107 is inserted. - The MICR characters on the inserted
check 1107 are first magnetized by the magnetizinghead 1101 arranged upstream of thetransport passage 1104, and then the data is read by thereading head 1103 arranged downstream of thetransport passage 1104. Note that the MICR character is temporarily magnetized by the magnetizinghead 1101 in order to recover the magnetization of the MICR characters, which has been weakened by being exposed to strong magnetic fields during the distribution process so that accurate data reading can be performed by thereading head 1103. - The arrangement of the magnetizing
head 1101 shown inFig. 11 (a) is specifically described.Fig. 11 (b) is a side cross-sectional view of the enlargement of the vicinity (inside Z framed by a dotted line) of the magnetizinghead 1101 of the media processing device shown inFig. 11 (a) . As shown inFig. 11 (b) , the magnetizinghead 1101 is arranged such that a slide-contact face 1101 a thereof is exposed to thetransport passage 1104 from theframe 1105. When acheck 1107 inserted to themedia processing device 1100 is transported to the position opposed to the magnetizinghead 1101, thecheck 1107 slides on the slide-contact face 1101 a of the magnetizinghead 1101 or moves while being in close proximity to the slide-contact face 1101 a of the magnetizinghead 1101. As thecheck 1107 passes the position opposed to the magnetizinghead 1101 in this manner, the MICR characters on thecheck 1107 are magnetized as described above. - However, in the
media processing device 1100 shown inFig. 11 (a) , theframe 1105 constituting thetransport passage 1104 is not continuous with the slide-contact face 1101 a of the magnetizing head 1101 (seeFig. 11 (b) ); therefore, a misshaped medium such as acheck 1107 with a folded edge may get stuck at the discontinuous section, causing a jam. - Also, dust can easily build up around the discontinuous section of the
frame 1105. Particularly, dust easily builds up due to the magnetic field generated by the magnetizinghead 1101. Consequently, when a large amount of dust builds up around this section, a jam is caused. - Further, in the
media processing device 1100 shown inFig. 11 (a) , the magnetizinghead 1101 needs to be fitted into a hole bored in theframe 1105; at that time, it may require time and effort to position the magnetizing head considering how much the magnetizinghead 1101 should be protruded from the hole or how much recessed from the hole. - Also, in the magnetizing
head 1101 which can be applied to themedia processing device 1100 shown inFig. 11 , there may be a case that the magnetization to the information recording media is weak depending on the mounting precision of the magnetizinghead 1101. Therefore, when a medium having a small retaining force is magnetized, it may be magnetized in the wrong direction. Then, when it is magnetized in the wrong direction, magnetic information on the information recording medium cannot be read correctly. - The present invention is devised considering the above problems, and an object is to provide a magnetic head which can prevent a degradation of reading accuracy of the magnetic information.
- To achieve the above and further objects, according to the present invention, there is provided a magnetic head comprising a magnet magnetized to an N pole and an S pole along the transport direction in which information recording media are transported, a yoke attached to a face of said permanent magnet opposed to said magnetic recording media, and a gap created in said yoke wherein at least one of the end portions of said gap is closed to form a closed section of said yoke, characterized in that said magnet is a permanent magnet, said yoke is located between said permanent magnet and the transported magnetic recording media, said gap is located between said permanent magnet and the transported magnetic recording media and is formed along a border line between the N pole and the S pole, and said closed section of said yoke is opposed to the magnetic recording media.
- According to the present invention, while maintaining precision of the gap length, the magnetic head can be easily assembled. Also, since at least one end portion of the magnetic head is closed, the magnetic short can be established, resulting in more effective use of leakage flux.
- According to the present invention, the magnetic head (magnetizing head) is provided with the yoke attached on the outside circumferential face of the magnet opposed to the transport passage in which information recording media are transported and a slit formed in the yoke such that the longitudinal direction thereof is perpendicular to the transport direction; since the yoke is extended to be longer than the magnet in the transport direction, of the magnetic flux produced from the magnet the leakage flux which is not needed for magnetization can be reduced.
- In other words, because of the yoke provided in the magnetic head and extended to be longer than the magnet in the transport direction, the leakage flux which enters the transport passage and flows in the direction opposite from the direction of the magnetic flux used for magnetization can be reduced. Therefore, when a medium having a small retaining force is transported, for example, magnetization in the wrong direction can be prevented, in turn preventing degradation of reading accuracy of the magnetic information. Also, the magnetic head of the present invention is configured such that at least one of the end portions of the slit is closed. Therefore, the leakage flux that leaks from the slit end portions can be reduced, thus preventing error in magnetization which is caused due to such a leakage flux.
- According to a preferred modification of the aforementioned embodiment, a tip end portion in said transport direction of an extended portion of the yoke is provided with a return yoke portion, and in particular can be bent toward a back yoke attached to an opposite face of said permanent magnet to form the return yoke portion.
- Further, in the present invention, it is preferred that the yoke be constructed from a single sheet of metal. In this way, the yoke can be easily attached to the magnet.
- Also, in the present invention, it is preferred that both end portions of the gap be closed. In this way, magnetic flux leakage can be concentrated toward the information recording media.
- In the following, preferred embodiments of the present invention are described with reference to the Figures, wherein
- Fig. 1
- is a cross-sectional side view showing the configuration of a media processing device of an embodiment of the present invention;
- Fig. 2
- shows a cross-sectional side view of an enlargement of the vicinity of the magnetizing head (inside a frame Y defined by a dotted line) of the media processing device shown in
Fig. 1(a) ; - Fig. 3
- includes diagrams showing an example of the detailed configuration of the magnetizing head shown in
Fig. 1(a) ; - Fig. 4
- includes explanatory diagrams showing the magnetic head of the present invention, wherein
Fig. 4(a) shows a front view of the plane which makes contact with an information recording medium (not illustrated),Fig. 4(b) shows a cross-sectional side view ofFig. 4(a) cutting along a line xx-xx, andFig. 4(c) shows a cross-sectional side view ofFig. 4(a) cutting along a line yy-yy; - Fig. 5
- includes a diagram showing a media processing device in which the magnetic head of the present invention is applied;
- Fig. 6
- includes a diagram showing a magnetic head of another embodiment of the present invention;
- Fig. 7
- shows a cross-sectional view of an enlargement of the vicinity of the magnetic head (inside the frame Y defined by a dotted line) of the media processing device of
Fig. 1(a) ; - Fig. 8
- shows an explanatory diagram of the configuration of a magnetic head of another embodiment of the present invention;
- Fig. 9
- shows a cross-sectional side view of the configuration of a magnetic head of another embodiment of the present invention;
- Fig. 10
- shows a cross-sectional side view of the configuration of a magnetic head of another embodiment of the present invention; and
- Fig. 11
- shows a cross-sectional side view of the configuration of a conventional media processing device.
-
Fig. 1 (a) is a cross-sectional side view of the configuration of amedia processing device 1 of an embodiment of the present invention. Note thatFig. 1 (b) is a diagram showing the external design of acheck 17 which is inserted into themedia processing device 1. Also, the media processing devices include card readers, for example, and magnetic cards other than checks may be used as information recording media. - In
Fig. 1 (a) , atransport passage 14 in which thecheck 17 is transported is constructed by aframe 15 formed of a nonmagnetic material. Also, around thetransport passage 14, a magnetizing head 11 (that corresponds to the magnetic head described in the claims), animage sensor 12, and a readinghead 13 are arranged. Note that thecheck 17 is taken into themedia processing device 1 via agate 16. Also, in themedia processing device 1, a drive roller (not illustrated) is provided; the drive roller applies the drive force to an endless belt (not illustrated) that forms part of thetransport passage 14 so that thecheck 17 is transported in thetransport passage 14. - The magnetizing
head 11 magnetizes magnetic material printed on the front surface of thecheck 17 such as the MICR characters 17a (seeFig. 1 (b) ); theimage sensor 12 scans the front surface of thecheck 17 and reads the image data; the readinghead 13 reads the MICR characters 17a that have been magnetized by the magnetizinghead 11. - The operation of the
media processing device 1 having such a configuration will be described hereinafter. First, when thecheck 17 is inserted at thegate 16, thecheck 17 is detected by a detection sensor which is not illustrated and the drive roller is driven to rotate. When the drive roller is rotated, a drive force is transmitted to the endless belt and thecheck 17 inserted at thegate 16 is transported further inside themedia processing device 1. Then, as thecheck 17 passes the position that faces the magnetizinghead 11, the MICR characters 17a are magnetized; as thecheck 17 passes the position that faces theimage sensor 12, the front surface of thecheck 17 is scanned; as thecheck 17 passes the readinghead 13, the data recorded in the MICR characters is read. - In the
media processing device 1 of this embodiment, the magnetizinghead 11 is embedded in theframe 15 while a portion of theframe 15 is interposed between the magnetizing head and the transport passage.Fig. 2 will be used to describe how the magnetizing head is embedded.Fig. 2 is a cross-sectional side view of an enlargement of the vicinity of the magnetic head 11 I (inside the frame Y defined by a dotted line) of the media processing device shown inFig. 1 (a) . - As shown in
Fig. 2 , between themagnetic head 11 and thetransport passage 14, a portion of theframe 15 is interposed. In other words, the bottom face of the magnetizinghead 11 in the figure (since the transportingpassage 14 is not discontinuous, even when the edge of thecheck 17 is folded, a jam is prevented from being caused in the vicinity of the magnetizinghead 11. Also, the surface of thetransport passage 14 opposed to the magnetizing head 11 ) is not exposed to thetransport passage 14. Therefore, dust accumulation is prevented near the position opposed to the frame constituting thetransport passage 14, ensuring the prevention of a jam. - Further, as shown in
Fig. 2 , the magnetizinghead 11 is arranged in therecess portion 15a cut in theframe 15 and bonded by an adhesive 20 to theframe 15 on the side opposite from thetransport passage 14. Therefore, themagnetic head 11 can be secured to the frame, obtaining reliability of the positioning. Also, the magnetizinghead 11 can be easily mounted. Further, because of the adhesive 20, dust is prevented from entering the gap between the magnetizinghead 11 and theframe 15. -
Fig. 3 is a diagram showing an example of the detailed configuration of the magnetizinghead 11 shown inFig. 1 (a) . - As shown in
Fig. 3 (a) , the magnetizinghead 11 in themedia processing device 1 is in a shape of rectangular solid, composed of apermanent magnet 11 a, afront yoke 11 b and aback yoke 11 c. As shown inFig. 3 (b) , in the center of thefront yoke 11 b an oblong slit 11 d is formed, and theslit 11 d functions as a gap to cause leakage flux from thepermanent magnet 11a. - In such a configuration, the magnetic flux produced from the N pole of the
permanent magnet 11a (the N pole on the right side inFig. 3 (a) ) mainly passes thefront yoke 11b near theslit 11 d, theframe 15, thetransport passage 14, theframe 15, and thefront yoke 11 b near theslit 11 d, and then returns to the S pole of thepermanent magnet 11 a (the S pole on the left side inFig. 3 (a) ).
Note that the depth of therecess portion 15a in theframe 15 or the distance between therecess portion 15a and thetransport passage 14 is configured such that, considering the magnetic force of thepermanent magnet 11 a or the magnetic force necessary to magnetize the MICR characters, the MICR characters formed on thecheck 17 transported in thetransport passage 14 can be magnetized. For example, in this embodiment, as shown inFig. 3 (a) , magnetic flux produced from the N pole of thepermanent magnet 11 a (the N pole on the right side inFig. 3 (a) ) is at the strength with which it flows through the inside of thetransport passage 14, i.e., it reaches the other frame which the magnetizinghead 11 is not provided. - As shown in
Fig. 3 (a) , the bottom face of therecess portion 15a of theframe 15 is in a flat shape, and the back face of thefront yoke 11 b opposed to bottom face in the flat shape (the face opposed to the transport passage 14) is also made in a flat shape, not in an R shape. Therefore, the positioning between the magnetizinghead 11 and theframe 15 can be simplified. Also, anormal magnetizing head 11 is covered by a case cover formed of aluminum, for example; however, the case cover can be omitted by using therecess portion 15a and the adhesive 20. This contributes to cost reduction. - For example, without cutting the
recess portion 15a in theframe 15, the magnetizinghead 11 may be simply fixed (by applying pressure) on theframe 15. Note that the adhesive 20 may be applied around the periphery of the magnetizinghead 11. Also, the dimension of therecess portion 15a cut in theframe 15 may be aligned with the dimension of the magnetizinghead 11 so that the magnetizinghead 11 is fitted into therecess portion 15a. In this way, the magnetizinghead 11 can be positioned without using the adhesive 20. - On the other hand, the material of the
frame 15 may be changed. Theframe 15 is formed of a resin material which is an example of a nonmagnetic material. Alternately, a ceramic frame may be used instead of the frame of a resin material. Note that, although the frame formed of a metal is used, the above materials may be used. Any material can be used as long as the magnetic flux produced from the magnetizinghead 11 magnetizes the MICR characters formed on thecheck 17 which is transported in thetransport passage 14. - Next, a magnetizing head (magnetic head) that can be applied to the
media processing device 1 for processing checks having the MICR characters printed thereon will be described in detail. Note that, although the magnetizing head is used for magnetizing the MICR characters, it is not limited to this use, but may be used as a demagnetizing head for weakening magnetization of the MICR characters. -
Fig. 4 is diagrams showing the magnetic head of the present invention: (a) is a front view of the surface of the magnetic head that makes contact with the information recording media (not illustrated); (b) is a cross-sectional side view of (a) cut along the xx-xx line; (c) is a cross-sectional side view of (a) cut along the yy-yy line. - As shown in
Fig. 4 (b) and (c) , the magnetizinghead 101 as a magnetic head has acuboid magnet 110 having the N poles and the S poles, ayoke 120A and aback yoke 120B attached sandwiching themagnet 110 between them, and agap 130 created in theyoke 120A. - The
magnet 110 is a cuboid permanent magnet and, as shown inFig. 4 (b) , magnetized to four poles of the N poles and the S poles in the cross section perpendicular to the media-transport direction. Note that the border line L between the N poles and the S poles is indicated by dotted lines inFig. 4 for easy description. Themagnet 110 can be any kind as long as it is a permanent magnet; in this embodiment, a stable ferrite magnet is used because of its large coercive force and resistance to demagnetization. - On the side of the
magnet 110 which faces the check as an information magnetic medium, theyoke 120A is secured by an adhesive, etc.; in the same manner, theback yoke 120B is secured by an adhesive, etc. on the opposite side [of the magnet 110]. As shown inFig. 4 (a) , theyoke 120A is in the same dimension with [that of] the shape of thesurface 111 of themagnet 110 on the side where the check slides over, covers the surface of the magnet 110 (entirely), and is formed from a single sheet of metal in this embodiment. - In the same manner, the
back yoke 120B is machined to the same dimension as that of the shape of thesurface 111 of themagnet 110 and secured by an adhesive or the like so as to cover the surface of the magnet 110 (entirely). - The
yoke 120A and theback yoke 120B are formed of a magnetic material and used to direct the magnetic flux supplied from themagnet 110 in a predetermined direction. Therefore, unnecessary leakage flux from themagnet 110 is prevented. Also, the material of theyoke 120A and backyoke 120B can be any material as long as it is easy to machine and can be magnetized; a ferromagnetic material having various kinds of soft magnetic properties or half-hard magnetic properties can be used. In this embodiment, a metal sheet is used. - Note that, in the first embodiment of the magnetic head, while the thickness of the
magnet 110 is 5mm, theyoke 120A is about 1 mm thick. Also, theback yoke 120B is about 1 mm thick. In other words, to increase productivity, theyoke 120A and theback yoke 120B are molded of the same material. - In the
yoke 120A agap 130 is created along the border line, L, to cause leakage flux. In this embodiment, thegap 130 is shaped like a groove; the bottom portion thereof reaches to thesurface 111 of themagnet 110, that is, themagnet 110 is exposed. In this embodiment, also, the groove that configures thegap 130 is constructed such that the width thereof is the same on both the media-sliding side and themagnet 110 surface side. - The
gap 130 has a predetermined length (hereinafter denoted as a gap length G) in the transport direction of the check (information magnetic medium) and a predetermined width, W, in the direction perpendicular to the transport direction of the check. The width, W, is equal to or slightly longer than the width of the data region created on the check that is being transported. - The gap length, G, is formed to be symmetric in the transport direction about the border line L. Note that, in the first embodiment, the gap length G is created integrally into the shape of the
yoke 120A by pressing. - In this embodiment, both end portions of the area (position) of the
gap 130 in the direction perpendicular to the transport direction of the check are closed; they are made as theclosed sections 135. Further, in this embodiment, theclosed sections 135 function as a magnetic short that shorts magnetism to reduce the generation of leakage flux. - The
gap 130 is created in a shape best suited for magnetization and demagnetization of normal checks; when an information recording medium is something other than a check, the design of [the gap] is modified according to the magnetic section of the information recording medium. - In this embodiment, the
yoke 120A is 1mm thick, and theclosed sections 135 have the widths w1, w2 of about 1 mm measured from the end portions on both sides of theyoke 120A. The widths w1, w2 of theclosed sections 135 are not limited to the number set in the first embodiment; although the two widths w1, w2 of theclosed sections 135 are set to the same number value from each other, 1 mm in this embodiment, they are not limited to the same width and the number value, 1 mm, but can be suitably changed to function according to the kinds of the information recording media which will be transported.
Note that when the widths w1, w2 of theclosed sections 135 are large, there will be no magnetic saturation and leakage flux at thegap 130 is reduced; therefore, the widths are suitably set through simulations. - In this embodiment, the
closed sections 135 are formed at the both ends of thegap 130; therefore, leakage flux is not easily produced in this structure except toward the information recording medium. In other words, themagnetic head 101 has the closedsections 135 which shorts magnetism, thus preventing excessive flux leakage. Further, leakage flux can be increased in the transport direction of the information recording media. - Next, a recording method is described.
The magnetizinghead 101 as a magnetic head is configured such that theyoke 120A having thegap 130 is fixed on themagnet 110 to create an annular magnetic path. In theyoke 120A, internal magnetic flux is produced from theyoke 120A that covers the N pole to theyoke 120A that covers the S pole; in thegap 130, leakage flux is generated from theyoke 120A that covers the N pole to theyoke 120A that covers the S pole, as indicated by arrow A. A check (information recording medium) is transported toward the magnetizinghead 101 and slides on the surface of theyoke 120A of the magnetizinghead 101. In the vicinity of thegap 130, leakage flux has been produced which links with the MICR characters on the check for magnetization. Since thepermanent magnet 110 is used in the first embodiment, the MICR characters on the check are magnetized uniformly by magnetization of constant size and direction. - Also, in this embodiment, the
magnetic head 101 has theback yoke 120B fixed on themagnet 110; in theback yoke 120B, the direction of internal magnetic flux is indicated by B as shown inFig. 4 (b) . In other words, theback yoke 120B is a magnetic short that shorts magnetism of themagnet 110. This configuration reduces the generation of unnecessary leakage flux to the outside. - The magnetizing
head 101 as a magnetic head of this embodiment has themagnet 110 which is magnetized to the N pole and the S pole along the direction in which a check as an information recording medium is transported, theyoke 120A attached to the face of themagnet 110 opposed to the check, and thegap 130 created in theyoke 120A, and theclosed section 135 is formed at least one of the end portions of the gap. Because of this configuration, the magnetizinghead 101 can be easily assembled while maintaining precision of the gap length, G. - Further, since the
yoke 120A is constructed from a single sheet of metal, theyoke 120A is fixed onto thesurface 111 of themagnet 110 by using an adhesive so that themagnetic head 101 can be easily installed while maintaining precision of the gap length, G, and no effort is required for the positioning of thegap 130. - Since the magnetizing
head 101 can short magnetism with theclosed sections 135 created at both ends of thegap 130, leakage flux from thegap 130 can be effectively used; since leakage flux is generated in the transport direction of the check, the flux quantum can be increased. In other words, leakage flux can be concentrated in the transport direction of the check because of theclosed sections 135 created in theyoke 120A. Further, excessive flux leakage can be prevented; therefore, the magnet can be downsized, thus making it possible to downsize checks or information recording media. - Furthermore, the
back yoke 120B is attached to the face of themagnet 110 on the opposite side from the face that faces the check; therefore, magnetic flux from the magnet is directed to theback yoke 120B to prevent the magnetic flux from flowing to the core of the magnetizinghead 101. - For example, the
yoke 120A and theback yoke 120B are formed in a shape to cover thesurface 111 of themagnet 110 and the opposite surface from thesurface 111; however, the shape is not limited to this. They may not be formed from a single sheet of metal, but the gap and the closed sections may be formed first and then the closed sections are joined together to create a single yoke. Even in this case, the closed sections make contact with each other to obtain precision of the gap length, G. - Also, the thickness of the
yoke 120A and theback yoke 120B can be any thickness as long as the thickness functions according to the type of the information recording media which are transported, and thus can be changed accordingly. -
Fig. 5 is a diagram showing a magnetic head of another embodiment of the present invention. Note that the same codes are given to the same components as those of the above-described first embodiment. In a magnetizinghead 150 as a magnetic head, a yoke and a back yoke are formed integrally, and ayoke 121A constructed from a single sheet of metal is used to cover the periphery of themagnet 110. Theyoke 121 A surrounding the periphery [of the magnet] directs magnetic flux supplied from themagnet 110 in a predetermined direction. Therefore, in the same manner as theyoke 120A and backyoke 120B shown inFig. 4 , unnecessary leakage flux from themagnet 110 is prevented. - Note that the magnetizing
head 150 has thecuboid magnet 110 magnetized to the N pole and the S pole, theyoke 121 A attached covering lit: interposing themagnet 110, and thegap 130 created in theyoke 121A, in the same manner as inFig. 4 . Themagnet 110 is covered with theyoke 121A provided with thegap 130. At the both end portions of thegap 130, theclosed sections 135 are formed. In this embodiment, theyoke 121A also functions as the back yoke.
Note that, in this embodiment, the shape of thegap 130 and theclosed sections 135 formed near thegap 130 are the same as those shown inFig. 4 , and their description is omitted. - In this embodiment, the
yoke 121A is formed so as to cover themagnet 110 around its periphery, that is, it is formed in a so-called carling shape having theend portions 151 to also cover the two sides of the magnet formed in the transport direction of the check. In other words, theyoke 121A is constructed from a single sheet of metal member. More specifically described, theyoke 121A covers four sides of the magnetizinghead 150. Note that theyoke 121A may be shaped as a cylinder without theend portions 151. - According to the above-described
magnetizing head 150, theyoke 121A covers four sides; therefore, the generation of excessive leakage flux can be further reduced and magnetic force is increased, making it possible to downsize themagnet 110, which in turn downsizes the magnetizinghead 150. - The shape of the
closed section 135 is not limited to the one shown inFig. 4 , but may be the one in a magnetizinghead 155 shown inFig. 6 . In other words, each of theclosed sections 135A shown inFig. 6 is constructed with the joined portion and the groove portion which is shorter in length than the gap length, G. Leakage flux will be generated from the groove portion to some extent; however, the groove portion has the function of magnetic short, as described above. - Note that, as shown in
Fig. 6 , the magnetizinghead 155 has thecuboid magnet 110 magnetized to the N pole and the S pole, a yoke 122A and a back yoke (not illustrated) having themagnet 110 interposed between them, and agap 130A created in the yoke 122A. The yoke 122A provided with thegap 130A is attached so as to cover themagnet 110. - The
magnet 110 used in the magnetizing head as a magnetic head shown inFig. 4 through Fig. 6 may be configured by a combination of divided magnets. - Next, the second embodiment of the magnetizing head (magnetic head) that can be applied to the media processing device of the present invention will be described referring to
Fig. 7 through Fig. 10 . Note that, although between the magnetizinghead Fig. 7 through Fig. 10 and thetransport passage 14, part of theframe 15 is interposed and embedded as shown inFig. 3 (a) , the illustration of the part of theframe 15 is omitted to simplify the drawing.
Fig. 7 is a cross-sectional side view of an enlargement of the vicinity of the magnetizing head (inside the frame Y defined by a dotted line) that can be applied to themedia processing device 1 shown inFig. 1 (a) . - As shown in
Fig. 7 (a) , a magnetizinghead 211 of the second embodiment is composed of amagnet 211 a magnetized to different poles (from the N pole to the S pole inFig. 7 (a) ) along the transport direction (from right to left inFig. 7 (a) ) in which acheck 17 is transported, ayoke 211 b attached to a face of the outside periphery of themagnet 211 a opposed to thetransport passage 14 in which thecheck 17 is transported, and aback yoke 211 c attached to another face of the outside periphery of themagnet 211 a on the opposite side from the face opposed to thetransport passage 14. Note that the magnetizinghead 211 1 is positioned (fixed) by an adhesive such as epoxy on the guide (such as a nonmagnetic SUS sheet) constituting the inside peripheral surface of thetransport passage 14 such that the top and bottom end faces of themagnet 211 a are parallel with respect to thecheck 17. -
Fig. 7 (b) is a view of theyoke 211 b seen from the transport passage. As shown inFig. 7 (b) , theyoke 211 b is constructed from a single sheet of metal, and a slit (also called "magnetic gap") is created in part of the yoke such that the longitudinal direction thereof is perpendicular to the transport direction (see the black colored portion inFig. 7 (b) ). The slit has both end portions closed. - In the
media processing device 1 of the present invention, theyoke 211 b constituting the magnetizinghead 211 is extended toward the readinghead 13 to be longer than themagnet 211 a in the transport direction of thecheck 17. Magnetic flux produced from themagnet 211 a is divided into magnetic flux used for magnetization (see the arrow AA inFig. 7 (a) ) and leakage flux which is not needed for magnetization (see the arrows BB, B'B' ofFig. 7 (a) ); because of the structure of theyoke 211 b, the latter leakage flux is directed to theyoke 211 b and does not easily enter thetransport passage 14; therefore, leakage flux which is not needed for magnetization is reduced from entering thetransport passage 14. More specifically described, if theyoke 211 b is not extended longer toward the readinghead 13, much of leakage flux flowing in the direction opposite from the arrow AA enters thetransport passage 14 as indicated by the dotted line arrow CC inFig. 7 (c) . On the other hand, when theyoke 211 b is extended longer toward the readinghead 13 as in this embodiment, the leakage flux indicated by the dotted line arrow CC flows like the leakage flux indicated by the arrow B'B', which does not enter thetransport passage 14 easily. Consequently, the leakage flux directed opposite (see the dotted line arrow CC) from the direction of the magnetic flux which is used for magnetization (see the arrow AA) can be reduced (or prevented), thus preventing degradation of reading accuracy of magnetic information. - Also, the front end portion of the
yoke 211 b shown inFig. 7 (a) is bent toward theback yoke 211 c to form areturn yoke portion 211 d. With this configuration, magnetic flux which is not needed for magnetization, that is the leakage flux indicated by a solid line arrow B'B', is guided to theyoke portion 211 b via thereturn yoke 211 d. As a result, a magnetic path having a low magnetic resistance is formed by theyoke 211 b, thereturn yoke portion 211 d, and theback yoke 211 c; therefore, the leakage flux entering thetransport passage 14 can be effectively reduced. - Further, there is a gap of a predetermined distance between the
return yoke portion 211 d and themagnet 211 a. By adjusting the distance for the gap to an optimal value, magnetic flux used for magnetization can be increased while reducing leakage flux entering thetransport passage 14. In other words, when thereturn yoke portion 211 d is formed too large, leakage flux entering thetransport passage 14 is reduced but also magnetic flux used for magnetization (see the arrow AA) may be reduced. Therefore, the size of thereturn yoke portion 211 d and the gap between thereturn yoke portion 211 d and themagnet 211 a are to be adjusted to optimal values. - As described above, according to the magnetizing
head 211 of this embodiment, theyoke portion 211 b is extended toward the readinghead 13; therefore, of the magnetic flux from themagnet 211 a, the unnecessary leakage flux which enters the transport passage 14 (indicated by the dotted line arrow CC inFig. 7 (a) ) can be reduced (or prevented), thus preventing degradation of reading accuracy of the magnetic information. Also, with theyoke 211 b (and thereturn yoke portion 211 d) a manufacturing process of creating a slit in the yoke in which two pieces of sheets, each of which has a recess portion, are put together is not needed; thus, the manufacturing process can be simplified. It is desirable that magnetic permeability of theyoke 211 b be even everywhere along the yoke; however, when the yoke is constructed from multiple metal sheets, it may be necessary to adjust magnetic permeability. In contrast, a yoke composed of a single sheet of metal does not require such adjustment. - Also, since both end portions of the slit created in the
yoke 211 b are closed, more leakage flux can be reduced compared to the configuration with only one end portion closed. - Further, the
back yoke 211c is attached to the face on the outside periphery of themagnet 211 a on the opposite side from the face opposed to thetransport passage 14; therefore, a magnetic path (magnetic circuit) having a low magnetic resistance can be formed on the face of the magnet on the opposite side from the face opposed to thetransport passage 14, and consequently, leakage flux from this face can be reduced.
Also, in a general magnetizing head that has the N pole to S pole arranged in this order from the gate toward the reading head, leakage flux directed in the opposite direction is easily generated in the vicinity of the yoke near the reading head (the S pole); however, in the magnetizinghead 211 of this embodiment, leakage flux can be reduced even by thereturn yoke portion 211 d as described above and also reduced by adjusting the gap between themagnet 211 a and thereturn yoke portion 211 d. - For example, the shorter the distance of the above-described gap, the less leakage flux entering the
transport passage 14. However, if the distance is shortened too much, the magnetic flux used for magnetization (the magnetic flux produced in the vicinity of the slit) will be reduced as well. Therefore, a predetermined distance needs to be set to an optimal value based on the relationship between the magnetic flux generated in the vicinity of the slit and the leakage flux which is not needed for magnetization. - Note that, according to the magnetizing
head 211 of this embodiment, there is no need to provide an opening to the guide which constitutes the inner peripheral face of thetransport passage 14, thus simplifying the manufacturing process. Also, the slit adjustment between the surface of themagnetic head 211 and the surface of thecheck 17 can be managed by the thickness of the sheet of the guide; therefore, the adjusting step is not needed, thus simplifying the manufacturing process. Further, since the outside dimension of themagnetic head 211 is small, freedom in designing themedia processing device 1 is improved. An installation holder to themedia processing device 1 can also be eliminated. - Note that, although the above embodiment is an example of the preferred embodiments of the present invention, [the present invention] is not limited to this embodiment, but can be variously modified within the scope of the present invention. For example,
Fig. 8 is an explanatory illustration of the configuration of a magnetizinghead 211A in themedia processing device 1 of another embodiment of the present invention. InFig. 7 (a) , theyoke portion 211 b is extended toward the readinghead 13 only; however, as shown inFig. 8 , theyoke portion 211 b may also be extended in the opposite direction from the readinghead 13. -
Fig. 9 is a cross-sectional side view of the configuration of a magnetizinghead 211 B of amedia processing device 1 of another embodiment of the present invention. - As shown in
Fig. 9 , in the magnetizinghead 211 B, thereturn yoke portion 211 d may be formed at the tip end of an incliningportion 211 e which is formed by bending part of theyoke portion 211 b. There is no need to specify that the part of theyoke portion 211 b be bent at obtuse angle or curled; it can be formed in any shape.
Since the incliningportion 211 e is provided in this manner, in thereturn yoke portion 211d there is no portion which is bent at right angle in the vicinity of thetransport passage 15; therefore, unnecessary magnetic flux is prevented from flowing toward thetransport passage 15. Also, when such a magnetizinghead 211 B is used, it may be arranged as in a conventional magnetic head such that its slide-contact surface, that is theyoke portion 211 b lit: thereturn yoke portion 211 d, is exposed from theframe 15 to thetransport passage 14. In other words, theframe 14 is not discontinuous in the vicinity of themagnetic head 211 B; therefore, dust is prevented from building up near the position in thetransport passage 15 facing themagnetic head 211 B, thus preventing a jam. -
Fig. 10 is a cross-sectional side view of the configuration of amagnetic head 211C in themedia processing device 1 of another embodiment of the present invention. In the above-described media processing device 1 (seeFig. 7 through Fig. 9 ), thereturn yoke portion 211 d is provided; however the device may be configured without the return yoke portion as shown inFig. 10 . In this case, processability is improved because thereturn yoke portion 211 d is not formed. - Also, the present invention is not limited to the above configuration, but the yoke may be extended only toward the reading head and the return yoke portion may be omitted.
- Further, the back yoke may be removed from the magnetizing head. Thus, it is possible to reduce leakage flux leaking from the yoke to the outside even without the back yoke.
- Furthermore, only one of the end portions of the yoke may be closed. With such a configuration, leakage flux can be reduced. Also, the yoke may be formed not from a single sheet of metal but by combining two metal sheets (left yoke, right yoke), each of which has a recess portion.
- Moreover, the magnetizing head may be arranged such that the slide-contact surface of the magnetizing head shown in
Fig. 3 through Fig. 10 , that is the return yoke portion, is exposed from the frame to the transport passage. -
- 1
- media processing device
- 11, 101, 211
- magnetizing head
- 14
- transport passage
- 15
- frame
- 15a
- recess portion
- 17
- information recording medium
- 20
- adhesive
- 110, 211a
- magnet
- 120A, 211b
- yoke
- 120B, 211c
- back yoke
- 130
- gap
- 135
- closed section
- 211d
- return yoke portion
- 211e
- inclining portion
Claims (6)
- A magnetic head comprising:a magnet (110) magnetized to an N pole and an S pole along the transport direction in which information recording media (17) are transported;a yoke (120A) attached to a face of said permanent magnet (110) opposed to said magnetic recording media; anda gap (130) created in said yoke (120A), wherein at least one of the end portions of said gap (130) is closed to form a closed section (135) of said yoke (120A);characterized in that
said magnet (110) is a permanent magnet;
said yoke (120A) is located between said permanent magnet (110) and the transported magnetic recording media (17);
said gap (130) is located between said permanent magnet (110) and the transported magnetic recording media (17) and is formed along a border line (L) between the N pole and the S pole; and
said closed section (135) of said yoke (120A) is opposed to the magnetic recording media (17). - The magnetic head as set forth in Claim 1 wherein said yoke (120A) is extended to be longer than said magnet (110) in said transport direction.
- The magnetic head as set forth in Claim 2, wherein a tip end portion in said transport direction of an extended portion of the yoke is provided with a return yoke portion.
- The magnetic head as set forth in claim 3, wherein the tip end portion of the extended portion of the yoke is bent toward a back yoke attached to an opposite face of said permanent magnet to form the return yoke portion.
- The magnetic head as set forth in at least any of Claim 1 trough Claim 4 wherein said yoke (120A) is configured by a single sheet of metal.
- The magnetic head as set forth in at least any of Claim 1 through Claim 5 wherein both end portions (135) of said gap (130) are closed.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006041221 | 2006-02-17 | ||
JP2006061175 | 2006-03-07 | ||
JP2006096817 | 2006-03-31 | ||
EP07714411A EP1988545B1 (en) | 2006-02-17 | 2007-02-16 | Medium processing device and magnetic head adaptable to same |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07714411.1 Division | 2007-02-16 | ||
EP07714411A Division EP1988545B1 (en) | 2006-02-17 | 2007-02-16 | Medium processing device and magnetic head adaptable to same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2363854A1 EP2363854A1 (en) | 2011-09-07 |
EP2363854B1 true EP2363854B1 (en) | 2014-07-16 |
Family
ID=38371642
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11167254.9A Not-in-force EP2363854B1 (en) | 2006-02-17 | 2007-02-16 | Medium processor and magnetic head adaptable to same |
EP07714411A Not-in-force EP1988545B1 (en) | 2006-02-17 | 2007-02-16 | Medium processing device and magnetic head adaptable to same |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07714411A Not-in-force EP1988545B1 (en) | 2006-02-17 | 2007-02-16 | Medium processing device and magnetic head adaptable to same |
Country Status (5)
Country | Link |
---|---|
US (1) | US7891568B2 (en) |
EP (2) | EP2363854B1 (en) |
JP (2) | JPWO2007094466A1 (en) |
AT (1) | ATE553476T1 (en) |
WO (1) | WO2007094466A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8141779B1 (en) * | 2007-08-17 | 2012-03-27 | Burroughs Payment Systems, Inc. | Sensor and markers for speed feedback in a hand-operated document reader/imager |
JP6188314B2 (en) * | 2012-11-26 | 2017-08-30 | 日本電産サンキョー株式会社 | Magnetic sensor device |
CN113302693B (en) * | 2019-01-17 | 2022-08-23 | 佳能电子株式会社 | Magnetic identification sensor |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2763729A (en) * | 1950-11-03 | 1956-09-18 | Armour Res Found | Core structure for magnetic transducer head |
US3665513A (en) * | 1969-12-29 | 1972-05-23 | Ibm | Passive magnetic transfer of discrete magnetic information |
US5237620A (en) * | 1989-05-01 | 1993-08-17 | Credit Verification Corporation | Check reader method and system for reading check MICR code |
JPH04167192A (en) * | 1990-10-31 | 1992-06-15 | Hitachi Metals Ltd | Automatic check reader |
JPH0733307A (en) | 1993-07-16 | 1995-02-03 | Omron Corp | Check processing device |
JP3843468B2 (en) * | 1994-12-27 | 2006-11-08 | セイコーエプソン株式会社 | Composite processing apparatus and control method thereof |
JPH09114941A (en) * | 1995-10-18 | 1997-05-02 | Star Micronics Co Ltd | Magnetic display eraser |
US6600823B1 (en) * | 1996-10-22 | 2003-07-29 | Unisys Corporation | Apparatus and method for enhancing check security |
US6504623B1 (en) * | 1998-01-05 | 2003-01-07 | Seiko Epson Corporation | Printing apparatus, a control method therefor and a computer readable information storage medium for recording a control program therefor |
JP3578042B2 (en) * | 2000-03-30 | 2004-10-20 | セイコーエプソン株式会社 | Magnetic reading device and compound processing device using the same |
JP3441444B2 (en) * | 2001-08-30 | 2003-09-02 | 松下電器産業株式会社 | Head for magnetization |
US7199957B2 (en) * | 2004-03-30 | 2007-04-03 | Imation Corp. | Write head alignment for full amplitude time-based servo |
-
2007
- 2007-02-16 WO PCT/JP2007/052881 patent/WO2007094466A1/en active Application Filing
- 2007-02-16 JP JP2008500569A patent/JPWO2007094466A1/en active Pending
- 2007-02-16 AT AT07714411T patent/ATE553476T1/en active
- 2007-02-16 EP EP11167254.9A patent/EP2363854B1/en not_active Not-in-force
- 2007-02-16 EP EP07714411A patent/EP1988545B1/en not_active Not-in-force
-
2008
- 2008-08-18 US US12/193,622 patent/US7891568B2/en active Active
-
2011
- 2011-09-12 JP JP2011197789A patent/JP2011249006A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPWO2007094466A1 (en) | 2009-07-09 |
US20090059422A1 (en) | 2009-03-05 |
EP2363854A1 (en) | 2011-09-07 |
EP1988545B1 (en) | 2012-04-11 |
WO2007094466A1 (en) | 2007-08-23 |
JP2011249006A (en) | 2011-12-08 |
EP1988545A1 (en) | 2008-11-05 |
US7891568B2 (en) | 2011-02-22 |
EP1988545A4 (en) | 2009-12-30 |
ATE553476T1 (en) | 2012-04-15 |
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